parameter-name

    Specifies the name of the parameter to modify. Instead of a
    name, you can enter a period (.)  to change the value of the most
    recently displayed or the most recently modified parameter. See
    the PARAMETERS SHOW command for an example of using the period in
    place of a parameter name.

    For a list of system parameters and further information about
    them, use the command HELP PARAMETERS.

 value

    Specifies the new value for the parameter. Enclose values for
    ASCII parameters in quotation marks if they contain embedded
    spaces or other special characters.

    Typically the value is an integer or the keyword DEFAULT. The
    keyword DEFAULT sets the parameter to its default value. The
    PARAMETERS SHOW command displays the defined minimum, maximum,
    and default values for the parameter, which are required unless
    range checking is disabled with the command PARAMETERS DISABLE
    CHECKS.